Mumei is Kei's only doll that was given to her by her parents, that have passed away. Long ago Mumei was only a doll to care for Kei when she got lonely, but presently Mumei has been used as a host, for multiple demons that haunt Kei and tell her what to do. Because of this some people may think Kei is a mad girl every time she talks to Mumei. So far the total of demon that haunt Kei is over 40. They all still live and visit Kei everyday but one has been killed by kei's friend. If only their was others to help Kei rid of all the demons haunting her, but Atlas that seems impossible.
